A 32-channel parallel transmit system add-on for 7T MRI

Orzada, Stephan; Solbach, Klaus; Gratz, Marcel; Brunheim, Sascha; Fiedler, Thomas M.; Johst, Sören; Bitz, Andreas K.; Shooshtary, Samaneh; Abuelhaija, Ashraf; Voelker, Maximilian N.; Rietsch, Stefan H. G.; Kraff, Oliver; Maderwald, Stefan; Flöser, Martina; Oehmigen, Mark; Quick, Harald H.; Ladd, Mark E.

doi:10.1371/journal.pone.0222452

Cited by 59 publications

(65 citation statements)

References 46 publications

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“…The same group also developed a custom‐built 32‐channel add‐on pTx system including custom RF amplifiers placed near the magnet bore and RF modulators to drive the array . This is ongoing hardware development and systematic evaluation, and we are expecting further 7T UHF body MRI results of this 32‐channel RF architecture in the near future …”

Section: Physicsmentioning

confidence: 94%

7T: Physics, safety, and potential clinical applications

Kraff

Quick

2017

Magnetic Resonance Imaging

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108

107

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Section: Physicsmentioning

confidence: 94%

7T: Physics, safety, and potential clinical applications

Kraff

Quick

2017

Magnetic Resonance Imaging

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108

107

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“…Both microstrip arrays have demonstrated a promising performance in terms of B1 homogeneity and SAR efficiency. The utilization of microstrip array did not stop on building head coils only, it has also been upgraded to build a whole body coil for both 8-channel body coil [50] and 32-channel body coil [51,52]. As a result, their corresponding arrays demonstrated promising results in terms of high image quality.…”

Section: Microstripline Elementsmentioning

confidence: 99%

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Abuelhaija¹,

Salama²,

Baldawi³

2020

PIER C

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Symmetrically excited meandered microstrip line RF coil elements are widely used in multichannel approaches; i.e., being integrated in ultra-high field magnetic resonance imaging (MRI) systems (i.e., 7-Tesla and higher). These elements have demonstrated strong magnetic field in deep areas through the object under imaging. Designing a radio frequency (RF) coil array that employs these elements without decoupling networks might cause non-optimized driving performance of coil array which in turn result in non-clear image. In this paper, two different methods of decoupling are studied: port decoupling and array elements decoupling. In the first one, the coil elements are designed at Larmor frequency (297.3 MHz), while in the other one, the coil elements are designed at higher frequencies but matched at Larmor frequency. Port decoupling does not always mean element decoupling. Conventional decoupling methods, such as single capacitor or inductor, face challenges to realize the coil element decoupling for meandered microstrip arrays. An optimized reactive (T-shaped) network is needed in order to achieve element decoupling which in turn prevents distortion of the EM field. All simulation results have been obtained using the CST time domain solver (CST AG, Darmstadt, Germany).

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“…Due to the promising results (e.g., image quality) achieved by using meander coils in 7T scanners, as mentioned before in this paper, several implementations have been done to build a Tx/Rx body coil using 8 channels [34,35] or 32 channels [36,37]. The 8-channel array in [34,35] consists of 8 meander coils in a circular arrangement.…”

Section: Decoupling Network For Coil Arraysmentioning

confidence: 99%

“…The body coil with 32 channels in [36,37] is shown in Figure 12a. It consists of 32 meander coils arranged in 3 interleaved rings.…”

Section: Decoupling Network For Coil Arraysmentioning

confidence: 99%

Decoupling network for Tx/Rx body coil for 7T MRI

Abuelhaija¹,

Salamh²,

Nashwan³

2019

Turk J Elec Eng & Comp Sci

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The parallel imaging technique is widely used in 7T MRI scanners. It employs multichannel RF coil arrays to apply a concurrent excitation and acquisition method. Concurrent excitation faces significant challenges in terms of electromagnetic coupling between the RF coil elements. In order to prevent interference between the RF coil elements' exciters, several decoupling methods have been developed to compensate for coupling and to permit independent work for the exciters. This paper studies the coupling between meander coils arranged in two different geometrical setups and investigates the isolation performance between the coils by applying two different decoupling networks depending on the geometrical setup of the coils. These two decoupling networks in addition to a T-shaped decoupling network have been integrated into a Tx/Rx body coil for 7 T to compensate for mutual coupling between array coil elements. The results have been obtained by using CST Microwave Studio (CST AG, Darmstadt, Germany).

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A 32-channel parallel transmit system add-on for 7T MRI

Cited by 59 publications

References 46 publications

7T: Physics, safety, and potential clinical applications

7T: Physics, safety, and potential clinical applications

Port Decoupling vs Array Elements Decoupling for Tx/Rx System at 7-Tesla Magnetic Resonance Imaging

Decoupling network for Tx/Rx body coil for 7T MRI

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